in-game signals between officials

[BktBallRef]

No, you simply base more importance on your position than necessary and interject yourself in the game where it's not needed. That's very apparent from your posts over the past year.

You would be better served following the instructions given to you and work to be the best you can be as a timer. If you want a more active role in the game, then became an official. Until such time as you choose to do that, run the clock appropriately, keep an accurate score, and use the horn when you're supposed to.